On every forum I've belonged to, I always hated seeing links to PhotoBucket or Flickr. Always slow and full of ads and you have to go through many contortions to click on and open the actual URL of the image itself and not inside the person's account. I never used either one myself. Years ago, I used VillagePhotos.com, they were good. They shut down for a while and then came back, but I don't know if they're still around anymore.
But Google Photos is so much better and easier than any of them. You can upload images to Google Drive, too. Free and lots of space. With Google available, I never understood why anyone bothered with PB or Flickr - yecch. Most VBulletin forums similar to this one allow members to have albums and then you can link to those in your posts - but it seems this one doesn't.