Regarding the feature request you’ve proposed, we will have our internal team conduct a thorough evaluation and discussion. Thank you again for your support!
When I run QFINDER on my MAC mini and Macbook Pro, as soon as I log into the network connection, the network drive appears in the sidebar of Finder! Also, the preview function can be used with the spacebar.
I think the OP is talking about something completely different. First of all, Qfinder is 100% not needed for anything. You can log into the network connection via the Mac’s own interface.
What the OP is talking about is Qsync - it is an entirely different program. Qsync has an offline files mode where files are stored on the NAS and have to be downloaded to the computer to view/access them. Files in that mode do not utilize the File Provider API and cannot be previewed.