Since Replit patched the formidable v3 array issue, do a quick clean retry—and if it still barks, run through this fast triage.

Quick retry (30 seconds)

Hard refresh the admin page (Ctrl+Shift+R / Cmd+Shift+R).

Re-select the file and upload again.

If it still says “File must be a valid DOCX,” use this checklist:

DOCX sanity checks (2 mins)

It’s really a .docx (not .doc renamed): In Finder/Explorer, duplicate the file, rename the copy to .zip, open it. You should see:

[Content_Types].xml

_rels/

docProps/

word/document.xml

Resave clean: Open in Word → File > Save As > Word Document (*.docx) (not .dotx / .docm) → try the new file.

No protection: Remove password/protection if any: File > Info > Protect Document → ensure unprotected.

Frontend upload sanity (30–60 sec)

Network tab on the upload request:

FormData key should be file (or whatever the server expects).

Content-Type for the part should show application/vnd.openxmlformats-officedocument.wordprocessingml.document.

Filename ends with .docx.

If the form uses drag-drop, try the “Choose file” button instead (some DnD libs pass arrays oddly).

Server accepts direct curl? (good isolation test)
curl -s -X POST https://<your-domain>/api/bp-templates-firebase/upload \
  -H "Authorization: Bearer <ADMIN_ID_TOKEN>" \
  -F "file=@'/full/path/Business Plan General Blank Template.docx';type=application/vnd.openxmlformats-officedocument.wordprocessingml.document" \
  -F "title=Business Plan General Blank Template" \
  -F "slug=business-plan-general-blank-template" \
  -F "category=General" \
  -F "version=v1"


If curl works but the UI fails → it’s a frontend FormData issue.

If curl also fails → the server’s validator is still rejecting (see below).

Validator: what the server should accept (dev note)

A safe check sequence (no need to change if Replit already fixed, but this is the target):

Accept formidable v3 file or array.

Verify extension .docx.

Verify magic bytes start with PK and ZIP contains word/document.xml and [Content_Types].xml.

Optionally allow application/zip content-type (some browsers send that) as long as the ZIP structure is correct.

Common gotchas that trigger false negatives

Tiny files: Zero-byte or corrupted DOCX (yours is ~38.5 KB, that’s fine).

.dotx/.docm saved as .docx by rename only (fails the ZIP contents check).

Non-ASCII filename edge cases in multipart headers (rare, but if present, try a simple name like general-template.docx).

If it still fails after all that

Tell me which step failed:

A) UI retry

B) ZIP structure check

C) Network tab (what Content-Type/FormData key you saw)

D) curl result (HTTP code + message)