Links for advertiser and gallery

hello, i know a lot of smart users here who can help me with this question. look, in my application there are 2 types of users, the buyer and the seller (author) how to make the author upload a lot of photos when creating a lot of ads, where the photo should belong to a specific ad. the question is how to make the author of ads upload images so that they belong to a specific ad? now adding a lot of photos, all ads contain all photos. help solve this🙏

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