Subsite Media folder - lots of js and css files generated ---
I'm not sure what caused this, but only in the subsite media file. I found that sometimes pictures disappear from my subsite (can't display) and I thought it was the problem caused by smush pro (change png to jpg...) so I disabled the option.
Now, I just check the media file folder in the subsite - I found lots of css and js files and they shouldn't be there.. and these files are huge http://prntscr.com/ekijmo
I've opened the site for backend support access: i-buddha.com and if you checking the site's upload folder: public_html/wp-content/uploads/sites/10/2017 you will see lots of them.
Please tell me whether the folder: public_html/wp-content/uploads/sites/10/2017.... stores other useful files and not just USER upload files?