I have a fairly large library with lots of pictures and videos. The ones that are only on the server have no thumbnails, which makes it hard to find the particular files that I’m looking for.
I found an earlier thread on the same subject
You may notice that OneDrive has thumbnail preview for placeholder files. That’s because OneDrive is a native application in MSIX format. But converting SeaDrive to MSIX format requires huge architectural change so it’s not on our plan.
I believe that this is incorrect. The microsoft sample uses the MSIX package to register the shell extension handlers, but it doesn’t seem like it absolutely has to be done that way. I think they could also be registered with regsvr32 or the win32 API. Or, the shell extensions themselves could be put in an MSIX without having to change the rest of seadrive to MSIX