I have exactly the same issue here.
I can login without any issues, open files and so on.
But when I go down into a (yes, large!) directorey it stays in “Waiting for server reply…”. It shows the folders and I can browse these folders. But opening a file (a jpg in most cases) will not work at all.
It looks like the app browses through the directory structure to update information about sizes and so on. And while doing so it is busy and does not download any other files. And because it is such a large directory (in my case 680GB with 120.000 fotos) the app will never succeed.
I logged inside tha app and attached the log file (stripped out sensitive information): ocapp.log (315.6 KB)
On the owncloud server itself I did not get any relevant log entries (Loglevel = 2) but I noticed once the request started a very little peak on CPU usage for the apache2 (any mariadb) process which went down to zero very quickly while the app still was showing “Waiting for server reply…”.
So anyone having an idea how to get this thing to work?
I am pretty sure it is not server related. When syncing with the MacOS app I do not have any issues with this folder. The initial sync takes a good amount of time (obviously) but once synced it is just working fine.