"hide download" - files in /tmp are huge

i am using the built-in CODE - Collabora Online Development Edition. i share a link and “hide download”. when the person receives and opens the link, collabora creates temp files and folders in “/tmp” on th server. the files and folders start with “lool”. they can grow to about 35GB. the file that i am sharing is a PDF that is about 90MB.

if i was to share a link to the file without “hide download”, the “/tmp” files/folders is just 130MB.