Greenby email - IMAP deleted emails purged - no longer available in trash folder

[#1]

Hi - I've just been migrated to Greenby, with mail set up as IMAP 

Prior to the move, whenever I deleted an email from my inbox on any device, it was moved to the Trash folder and still visible there on various devices (using different clients eg Outlook; K9-mail etc) 

Since the migration, the deletion from inbox is being replicated across devices (in the same way as crearing new/sent emails etc) as expected

However a deleted email now seems to be gone forever - the actual deletion is being replicated/synched across devices, but the deleted/trash folder is empty across all devices as if the trash folder is being immediately purged to permanently delete them

Is it just me, or is there some setting which will stop the trash folder being purged? TIA

[#2]

Check that you don't have multiple Trash folders and you're subscribed to the wrong one. On the Plusnet system all folders were under the INBOX but the migration seems to create some folders under the root directory under some circumstances

See this thread for an example of how to find folders with webmail https://community.plus.net/t5/Email/Greenby-Migration-Questions/m-p/2032680#M56559