Instant Photo backup doesn't complete for large video files

I’ve been using the instant upload feature for photo backup from iPhone to server and then syncing to macos client. It generally works quite well, the only issue I notice is that if I have large video file, not really that big but lets say 100MB and over. The upload will start no problem, but then it will usually stall out. I think once the screen goes blank and the iphone password access time limit is reached (I think 5 minutes in my case), the upload is not able to continue.
Any ways to deal with this without changing my iPhone’s screen off time settings?

I just want to confirm that all video files that are over 100mb are not being uploaded. Any idea if this is a limitation of my upload speed? a setting on my nextcloud server? a limitation in nextcloud?