Importing notes from Evernote containing an excel file not working

Importing notes from Evernote containing an excel file not working

Hello everyone, 
I am currently moving all of my Evernote notes in separate stages from different notebooks to Nimbus to prepare my full switch. But right now I am experiencing a certain problem.
There are a number of notes missing after the import in each notebook. From my first comparison with the original notebooks (EN) and searches for the title in Nimbus, it seems like all my notes containing an excel file are not getting imported. 
I even tried to import a single note containing an excel file separately -  the note is visible for a couple of seconds in my destination folder, but then the note simply disappears and - if I am quick enough and click on the note - the following message is displayed: "Note has been removed or moved to other workspace"  

(I only have one workspace)

Any idea what I can do to fix this?