[BetterRed]

@Josieb1 - the conflicts are almost certainly due to the fact that you run the calibre library manager and the dropbox client concurrently - see FAQ - I am getting errors with my calibre library on a networked drive/NAS?

Consider using the calibre Content Server to make your books available on other computers. Run calibre on a single computer and access it via the Content Server or a Remote Desktop solution.

If you must share the actual library, use a file syncing tool like DropBox or rsync instead of a networked drive. If you are using a file-syncing tool it is essential that you make sure that both calibre and the file syncing tool do not try to access the calibre library at the same time. In other words, do not run the file syncing tool and calibre at the same time.

Even with these tools there is danger of data corruption/loss, so only do this if you are willing to live with that risk.

Basically that means suspending Dropbox before starting calibre. Before resuming Dropbox I recommend running the calibre-db --backup_metadata command, that will flush any pending opf writes.

Aside - a search of the manual for 'dropbox' puts the FAQ I've cited as the first item, and a thread search for 'dropbox' in the MR Calibre forum should find a number of threads with the same advice.

BR