Conflict management: more choice

[jsilvestre]

@goofy-bz suggested on the forum that a cool option during conflict resolution would be:

When uploading a file with already existing name, there should be an extra option. Currently we can

• overwrite (work as expected)
• skip, which result in nothing, it seems nothing is uploading, equivalent to cancel upload My wish is a message telling:

A file with with name %filename already exists

You can choose to overwrite it or upload a new version with an appended file number: %filename (2)

and then 3 buttons with related features:

Overwrite | New version | Cancel

(https://forum.cozy.io/t/feature-request-uploading-a-file-with-same-name-should-offer-more-options/298)