Thx for answering, well in fact I always knew this problem (with another but linked i suppose : dash on left capacity of the UI) so this Monday I decided to erase all my data by a full restore, the problem was solved of course. After I put a few photos on the Wdmycloud, the database has been built in a minute and I could view my thumbnails in WD Photos Android App.
Next, I copied all my 56000 photos, and 2100 little videos, after that I’ve waited about 12 hours for having “idle” in the “Content Scan” Area of the UI, so for me the “indexing” job was done, so return to the WD Photos App and no way, I only see the first salve of photo copied before.
I’ve cleared the cache in the android app to force re-sync and know the app tell me that there is no photo on the device, i checked the thumbnails by ssh, it seems ok. I’ve got also a wdphotos.db file but it seem empty, well I’m lost.
For now, I’ve done a cold reset after disabling cloud access, re-activate cloud access : always nothing in Wd Photos App. So I launch again a re-rebuild of the content database and I’m waiting the result.
Do you have questions to help you for diagnostic ?
(As you can see I always wait for the end of the database building before rebooting, or doing anything, I’m on that since Monday…)