The trouble is with uploading a BED file from your local computer to a Galaxy instance? Or some other function?
A local, cloud, or public Galaxy instance? Galaxy Main (http://usegalaxy.org)?
This is the Upload help .. please try the instructions and send more information about what you are trying to do if this does not resolve the issue: https://wiki.galaxyproject.org/Support#Loading_data
Thanks, Jen, Galaxy team