Hi again,
 
I've already done what you guys have suggested, but when I tried uploading a file, I got this error:
 
The directory <some directory here> contains no valid files
 
I checked if I placed the right path and created the correct folder, and everything seems fine. The file is a FASTQ file (ending in .fq). What could be causing Galaxy to see the file as not valid for upload?
 
Thanks for the help!