Yes, the forum will need to allow you to store your photos on it and then typically you would attach your photo to your post in that forum.
On this forum uploading/attachments is allowed in the film and screenshots area, for film and screenshots.
Other non-film and non-screenshot photos need to be uploaded somewhere else and then linked to from here.
Other than that, if you belong to a squad who has a website see if they will allocate you some space and you could upload there and then create a link on the forum of your choice, to that image.
i may be wrong but i think sharing directly from google drive might be prohibited now, but if i'm wrong , then that's another option.