banger
@BuzzPCSOS
Hello
First of all, thank you for your answers.
To answer @BuzzPCSOS , via a USB cable connection, file transfer between the two devices works in both directions. However, via KDE Connect, I can't send files from the computer to the phone unless I use Thunar, click on the photo and do “send to” using KDE connect and check the box, “Open on an associated device”. The photo then appears on the phone's screen. I still get a notification on the phone that the file can't be transferred to the phone. In fact, it's only displayed and I can't find it in the phone's folder.
To answer @banger.
I checked all permissions on the phone and on KDE connect, I defined a destination folder but it doesn't work.
This doesn't matter, because I can always transfer via USB cable.
I'll wait a few days to see if other solutions are offered, otherwise I'll mark the post as resolved.
Thanks again for your answers. Have a nice day. Best Regards
Translated with DeepL.com (free version)