Nextcloud sync timeout

I’m trying to set up nextcloud sync to test another issue. I have an empty profile with a note that has a 50MB attachment.

I can sync smaller notes but when it comes to that large one it never syncs and in the log there’s this:

2020-04-19 09:04:02: "Uploading a large resource (resourceId: 2d561989d0284a7bbbe383a529c0bd0c, size:52050628 bytes) which may tie up the sync process."
2020-04-19 09:08:58: "Running background sync on timer..."
2020-04-19 09:08:58: "Scheduling sync operation...", "0"
2020-04-19 09:08:58: "Preparing scheduled sync"
2020-04-19 09:08:58: "Starting scheduled sync"
2020-04-19 09:08:58: "Synchronisation is already in progress. State: in_progress"
2020-04-19 09:12:23: "FetchError: network timeout at: https://my-server/remote.php/webdav/Joplin/.resource/2d561989d0284a7bbbe383a529c0bd0c
FetchError: network timeout at: https://my-server/remote.php/webdav/Joplin/.resource/2d561989d0284a7bbbe383a529c0bd0c
    at C:\Users\Me\AppData\Local\Temp\1aaNjl3NR2Q97fx2ybPJsz9pDT8\resources\app.asar\node_modules\node-fetch\index.js:126:13"
2020-04-19 09:12:23: "Operations completed: "

My upload speed is pretty bad, there’s nothing I can do about that. Is there any way to increase the timeout?