Allow users to upload attachments to certain posts

One way to do this might be with a plugin such as Gravity Forms, they allow you to create posts from a form, you can upload images too. They have an add on that helps you with this:
https://www.gravityforms.com/add-ons/advanced-post-creation/

You can also see a bit more on this information here: https://fewerthanthree.com/tutorial/using-gravity-forms-multi-file-uploads-when-creating-a-new-post/

There might be other options like Gravity Forms for Pods (if this is what you are using)

Hope it helps you.

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