For security reasons, your legals documents :
- Legal identification certificate
- National social registration and contributions
must be in PDF format and be with a 3 Mo size maximal.
For any additionals documents, you'll can see the format accepted when you'll update your documents (xlsx, Word, PDF...)
How to convert/merge/compress your documents on the right format ?
You can use those websites to make any format modfication :
For any further information, please go on this topic.