Where exactly do you see this? In View > Sidebar > Import > Emails? Is the plugin for Apple Mail installed & enabled? Does it make a difference whether Apple Mail is already running or not? And finally, is anything logged to Windows > Log?
@Paul I am curious to learn how you have done your archival. Or was it importing maybe?
As I am doing some tests on email import and archive just right now, I can tell you that on my Catalina setup with DT3.5.1 things seem to be working fine, this is the result of the archive of my test Gmail account:
New email tests is a new database I have created specifically for this kind of tests, and by selecting “Archive Mailbox“ this is the resulting structure. Granted, I have no labels/folders in my setup, but as you can see the full structure of the mailbox has been correctly archived.
I had to fight a little to understand the real difference between import and archive but this old message from @BLUEFROG made things clear to me:
I closed and opened DT3 about 3 times over a 4 hour period and on the last reopen, it is now displaying the structure of my Gmail/Apple mail box now and I can Archive from a particular folder & it Archives all sub folders outstanding emails.
Just strange and inconsistent behaviour, where on some occasions when opened the folder structure is lost & all folders displayed on same level & treated as individual folders with no subfolder relationship.
Nothing else like Refreshing the mailbox from within DT3 helps.
Hopefully this will be fixed in a future release to be reliable & consistent behaviour.
As explained above, after 3 attempts to restart DT3 the problem disappeared by itself & the correct structure of the folders was displayed in the import screen.
This righted itself before I did a Apple Mail Mailbox Rebuild, but yes have done as suggested, but I cannot tell if this has had any effect. If the issue is observed again, I will try the Rebuild of the mailbox first to see if this can be a way to reliably address the issue if & when it occurs.
just though i would update on this problem After 25+ days I eventually restarted DT3 and now I have again lost the folder structure of my Gmail email, via Mac Mail. This time after multiple restarts no luck in regaining the structure, h=just a single level display of all folders and subfolders.
This has pretty much trashed any automation I had done of filing based on specific folders and if I now Archive a folder, it creates a new folder in DT3 database and any automation is redundant as this is now seen as a brand new folder.
I have rebuilt the Gmail to Mac Mail several times, but no change & in MHO is a DT3 problem.
It would be great if this got some attention and was sorted out.
The mailbox hierarchy can’t be used without the plugin, see second message in Log window. Did you install the plugin (e.g. an update of macOS might require a reinstallation), is it still enabled in Mail’s preferences?