Recovering lost data after importing bases

[MariaMaidana]

Hi everyone! 

I was wondering if it's possible to recover lost data after importing bases. 
When I copied and imported a whole table to a new blank one, some of the data was imported, but some other was lost and I have blank fields now. Namely; the attachments (pdfs). 

Does anyone know if/how I can recover those at all? 
Thanks in advance! 

[TheTimeSavingCo]

It sounds like you did this by downloading the original tables as a CSV, and then importing the CSV?  If so, I'm not sure if there's a way to get that data back and I hope someone else can help with that

Do you have access to the original bases?  If so, perhaps you could try duplicating the original bases / syncing them to your new base instead?  That should keep the attachments