Cannot checkout branch due to untracked file

[Per Eghall]

Hi folks,

File status in Branch1 displays clean for all files. Now I want to checkout Branch2, however, I get an error: The following untracked working tree files would be overwritten by checkout: file.svg.

The thing is that file.svg displays as clean. Also, a git clean -f doesn't change this, file.svg still is untracked according to checkout error. 
I've tried deleting the file.svg -> Staging > Comitting -> Push. Then adding file.svg back to local repo ->  Staging > Comitting -> Push. Checkout of Branch2 still triggers error about file.svg being untracked.

Any ideas?

Best regards,

Per