Nextcloud Files Version 4 is the last one that is at all usable on macOS (arm64), the new one (33 onwards) doesn’t open properly about 80% of the times I try to open it:
In the rare cases where it opens, it simply doesn’t sync any macOS “bundles” (which appear as files in macOS but are just folders beneath, for example “.app”, “.logicx”, “.band”) anymore, and seems to quit after a short time.
I have reverted to 4.0.11, which interestingly is also ~300% the file size of those new versions, which as far as I can tell is the last working version for macOS:
https://download.nextcloud.com/desktop/releases/Mac/Installer/Nextcloud-4.0.11.pkg