Import large PST succeeds but all attachments are gone

After I imported 5 PST files of each 10 GB plus a smaller 2 GB PST file I noticed that all the mails are there but all attachments that were originally attached to the messages are gone.
Does anyone know if this is a limitation of the free version ?  I’d be more than happy to pay for the Pro version if that’s a solution to my problem.

No, this is not a limitation of the Free License.

Maybe create a new folder in MS Outlook, and copy a few messages with attachments to that folder. Then import just that folder into eM Client and see what happens.