File Upload Error

Hello all !
I am a newbie but have a serious issue

I use owncloud 10.3 used to be with version 8 and later 10.0.2 I think but did fresh nstalls no direct uogrades.

So the issue is this. I can’t upload certain file types to the server.
I get this same error

One file conflict
Which files do you want to keep?
If you select both versions, the copied file will have a number added to its name.

Owncloud shows an image file icon and a folder icon

Be advised I have never added a single file before in the server.
It does so with Adobe Illustrator files, some video files too. may be more.
But jpeg, adobe photoshop files have no issues.

Please help