Android: Best way to upload all pictures

Greetins,

finally I found some time to install Nextcloud on my Ubuntu box (all latest). My main goal was to upload all my cellphone pictures and videos, including all other folders (like Snapseed and such). Apparentyl picture upload works on new photos, but not on the old ones. Also, I do not understand how the upload of other folders works. Do I have to create them first on my Nextcloud Account? Is there any documentation around for that case? All I see are old threads from 16 or 18. Or maybe I am just bad at googling.

Many thanks for your help, and sorry if that topic was already discussed.

Thanks
Johannes

Thanks Kolja,

but that does not solve my problem. The sync does not work with pictures already taken. Is there anything else I can do?

Thanks
Johannes