Can't copy file names from FileZilla

Hi! I installed MarketPress Premium and did a site backup. 81
files couldn't be downloaded to my computer. I wanted to copy their
names and paste in a txt file to send you, in order to know if these
files can prejudice my backup. I selected the files and right-clicked
them to copy, but there was no copy option; I also tried the Ctrl+C,
Ctrl+V command, but it didn't work.
How do I copy the names of these files and paste them in a txt