Small Update: When uploading images from the tor mirror, they are stored in the DB with the onion address. One workaround I'm currently applying is running a script periodically that updates image links. It looks like this:
UPDATE post SET url = REPLACE(url, 'http://your-hidden-address.onion', 'https://your-clear-domain.tld')
And btw all this is for version 0.18.3 (to avoid confusion in the future)
Thank you