Thanks Sam. I can confirm that my app returns false for folderitem.iswritable when the client attempts to write a file to this network drive. I removed the check code that used folderitem.iswritable because of the comments I found in this Xojo forum post.
Either way, my app is able to write to a local drive and the user is able to copy the files to the network folder using the Finder. Do you know if an app like Finder can have different permissions compared to a different app? As in, is there anything one needs to do within a Xojo app to allow it to write files on a network drive using smb protocol? I’m not familiar with different network protocols, I’ve only read that smb was created by Microsoft so I’m not sure if that’s somehow an issue writing a file from a macOS app.