I have a Linux desktop PC and a Linux (Debian) server with SMB-based shares. If I choose to add an attachment from a remote, non-home folder - such as 'data' and 'docs' - then I can access them by navigating to the needed file through 'Attach'...'+ other locations', selecting the share by name and continuing navigation to select a file. However I cannot add files from /home/myhomefolder on the network; this is presented by Thunderbird as 'Homes on [IP Address]', but selecting it does not take me to my home folder. There is a quirk with some apps whereby the shares only become accessible if they have been visited previously using the stock desktop's file browser, but this does not apply here; I can open other apps, such as Geany text editor and reach /home/myhomefolder without a problem. Not quite the same thing, but the file browser in, for example, Geany, Libre Office, and many other apps, recognises, shows and lets me use the bookmarks I have setup to network locations, but the Thunderbird one is much simpler and only lists '+ other locations' and offers the problem navigation described earlier. It seems as if the file browsing function in Thunderbird is less sophisticated and/or based on a library that doesn't work properly with all types of network share. At the moment, I have to use the stock desktop file browser to copy files to attach into a local 'temp' folder where I can select them in Thunderbird. Any thoughts on a solution?