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easy way is to upload via FTP and post a link. even you pause cloudflare, cache may not be allow you upload, need time I guess.

we are using non cloudflare, addons have nothing to do with upload

once you setted correct value in Maximum attachment file size 500000KB

which is in Setup > Option > Attachments

in server side as well.

PHP post_max_size10000M

PHP upload_max_filesize10000M

for me 10GB works great.

I am happy that not using Cloudflare which is slow & terrible for SEO