Immich not able to sync all photos to server, what could possibly the reason ?

[xlrshubham]

I have around 600 photos in Screenshot folder, and I have also added 100 photos from screenshot from different phone. I was hoping all 700 photos will be synced to my self hosted server. But 100 from old phone and only around 500 from new phone are getting shared.
Manual upload gives "Failed to upload" without any specific error, no logs at the server side. Where can I find out the exact reason for failure ?

[xlrshubham]

My Bad, I was using nginx reverse proxy which had default limit of 1MB file, so bigger files were not uploading.