Try to compress it first. From the graphical file browser, you can right-click on the file "Xorg.0.log" and choose, in the contextual menu that pops up, "Compress...". You must choose a location where to save the compressed file and you must have the permission to write at this location (e.g., you cannot write in /var/log unless you first acquire the administrative permissions). The default location is your "home", i.e., the directory where all your personal files are. You should be allowed to upload the compressed file (I hope).

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