This is designed to remove options from a dynamic field. The number of times the option can be used is set in the form the dynamic field pulls from. Add a quantity field in the linked form, and insert your limits there. Or if you would like all options to have the same limit, use the example above.

Use this code to make certain fields read-only when editing the entry on the front-end.

If you are using a caching plugin setup with a CDN, it will work best if you leave the uploads in the regular uploads folder.