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@switchingsocial@mastodon.at @chris @nextcloud
The Nextcloud instance probably just needs more RAM/processing power for that many photos to upload. If you can鈥檛 give it more resources, then I would copy it to the Nextcloud server via an external drive or via SSH and then move it to the appropriate directory for your Nextcloud user.
Even if they are in the right directory, Nextcloud would have to rescan your files to see the photos, which you would trigger using the occ command.