1.4Reference a file (“/file”)
The essentials in 30 seconds
- '/' = point, not copy-paste: typing / opens the recent-files picker — the chosen document becomes the source of the request.
- Cloud condition: only files on OneDrive/SharePoint indexed by the Graph are referenceable — never a local file.
- Cross and stylize: multi-file (compare, synthesize, contradictions) + substance from A, style from B for deliverables matching house standards.
Threaded mini-case — Hicham crosses two files in Algiers
Hicham must draft the meeting report of a meeting from his notes, in the style of the March report, then compare two versions of a supplier contract. He types '/' in the Copilot pane: the picker lists his recent OneDrive files. He asks 'Draft the meeting report from /Notes-reunion-12-oct in the style of /CR-mars' — substance from one source, form from another — then 'Compare /Contrat-fournisseur-v1 and /Contrat-fournisseur-v2. List in a table: clause | change | impact for us.' He then checks the high-stakes clauses against the source passages before negotiating. No more copy-pasting entire contents.
Sequel and end of cases 1.1-1.3 — Hicham activates his files as sources.
1. The slash that changes everything and its cloud condition
In the Copilot prompt, the '/' reference opens the recent-files picker: the chosen document becomes a source of the request. No more copy-pasting entire contents into the prompt — you point to the file, Copilot reads it.
Non-negotiable condition: the cloud condition. Only OneDrive/SharePoint files (indexed by the Graph) are referenceable. A file stored locally on your PC is not — hence the value of centralizing everything in the cloud. If a file does not appear, open it once to bring it back into recent activity.
2. Cross several files: substance from one source, form from another
The power comes from multi-file: several references in one prompt. 'Compare /Contrat-v1 and /Contrat-v2 and list the differences', 'Synthesize /Rapport-A and /Rapport-B'. Summary, comparison, contradiction detection: two or three files meet in a single request.
The most elegant technique: style from a template. 'Draft the meeting report from /Notes-reunion in the style of /CR-mars' — Copilot takes the substance from one source and the form from another. Result: documents immediately matching house standards, without describing your template.
🔎 Concrete example — 🔎 Concrete example — Compare two versions of a contract
Twenty pages reviewed in one table — like Hicham on the supplier contract.
Prompt: 'Compare /Contrat-fournisseur-v1 and /Contrat-fournisseur-v2. List in a table: clause | change | impact for us.'Reading: a table of differences in seconds, with cross-references to the passages.
Lesson: click the high-stakes clauses to confirm the exact change before negotiating.
Section vocabulary
- '/' reference
- In the Copilot prompt, / opens the recent-files picker: the chosen document becomes a source of the request.
Simple example: The /Notes-reunion-12-oct pointed to by Hicham in the Copilot pane.
What it is not: pasting 20 pages of content into the prompt.
Reflex: type '/' and pick the source, always.
- Multi-file
- Several references in one prompt: 'Compare /Contrat-v1 and /Contrat-v2 and list the differences'.
Simple example: The two versions of the supplier contract crossed by Hicham.
What it is not: a single source per request when two are needed.
Reflex: summary, comparison, contradiction = several '/'.
- Cloud condition
- Only OneDrive/SharePoint files (indexed by the Graph) are referenceable — a local file is not.
Simple example: Hicham's folders centralized on OneDrive before '/'.
What it is not: looking for a local-drive file in the picker.
Reflex: file not found = local? old? permissions?
- Style from a template
- 'Draft the meeting report from /Notes-reunion in the style of /CR-mars': substance from one source, form from another.
Simple example: Hicham's new report matching house standards via /CR-mars.
What it is not: describing the house template in ten lines at every request.
Reflex: an old deliverable as a living style template.
In practice — Hands-on — Generate a document by crossing sources
- Make sure your working files are on OneDrive/SharePoint (not local).
- In a new Word document, open the Copilot pane and type '/': the picker lists your recent files.
- Ask: 'Draft a one-page summary from /[file 1], in 3 parts: findings, risks, next steps'.
- Then cross: 'What information in /[file 2] contradicts or completes this summary?' — check 2 points against the sources.
Ready-to-say script — reference two files (30 s)
'In the Copilot pane I type slash, I pick my two OneDrive files: Compare /Contrat-fournisseur-v1 and /Contrat-fournisseur-v2 — table clause, change, impact. And for the meeting report: draft from /Notes-reunion in the style of /CR-mars. Then I check the high-stakes clauses against the sources.'
Say while typing '/' live; show the recent-files picker.
Copy-paste template — prompts with '/' references
SUMMARY: 'Draft a one-page summary from /[file 1]: findings, risks, next steps.'
COMPARISON: 'Compare /[file A] and /[file B]. Table: clause | change | impact for us.'
SUBSTANCE + FORM: 'Draft the meeting report from /[notes] in the style of /[template].'
CONTRADICTION: 'What information in /[file 2] contradicts or completes this summary?'Report to standard in Algiers
Like Hicham: substance from the notes, style from the March report — the new report immediately matches house standards.
Supplier comparison
v1 versus v2 in a clause/change/impact table: negotiation rests on verified differences, not on a full re-read.
Multi-source summary
Two reports synthesized into one findings/risks/steps page: Copilot crosses what classic search keeps separate.
File not found
Local file → move to OneDrive; too old → open it once; no access → check the account: the 3 classic causes.
✓ Best practices
- Centralize your files on OneDrive/SharePoint: only the cloud is referenceable via '/'.
- Use old deliverables as style templates: 'in the style of /CR-mars' imposes your standards without describing them.
- For a file missing after '/', open it once: it then moves back into your recent activity.
✗ Common pitfalls
- Trying to reference a local file: only OneDrive/SharePoint files are indexed by the Graph.
- Pasting the entire content of a file into the prompt when '/' references it directly.
- Forgetting to check the high-stakes passages of an automatic comparison before deciding.
Key takeaways
- / turns your files into sources: no more copy-pasting contents into the prompt.
- Several files cross in one request: summary, comparison, contradiction.
- Non-negotiable condition: files live on OneDrive/SharePoint (not local).
- The 'substance from A, style from B' technique produces documents immediately matching house standards.
48h challenge — apply tomorrow
Check that 2 recent documents are on OneDrive, type '/' in Copilot, launch a single-source summary then a two-source crossing (template above), and test substance/form with an old deliverable. Check 2 points against the sources.
- I reference a file with '/' instead of copy-pasting.
- I cross several files (summary, comparison, contradiction).
- I produce substance from A + style from B, verified against the sources.
Frequently asked questions
The file I want to reference does not appear after '/', why?
Three classic causes: it is stored locally (move it to OneDrive), it is too old in your activity (open it once), or you have no access with this account.
Can I reference an email or a meeting, not only files?
Yes, in applications where the context allows (Outlook, Teams, and the 'work' Copilot chat): people, meetings and emails also become sources — that is the subject of level 4.
What is the condition for referencing a file with '/' in Copilot?