You are generally not permitted to share marketplace assets. An exception to this is employees and contractors that are genuinely building a project on your behalf:
You also may Distribute Content to an Engine Licensee who is your employee or your contractor regardless of whether they have rights under their license to the same Content, but only to permit that Engine Licensee to utilize that Content in good faith to develop a Product on your behalf for Distribution by you under the License, and not for the purpose of Content pooling or any other Distribution or sublicensing of Content that is not permitted under this Agreement. Recipients of such a Distribution have a limited license to use, reproduce, display, perform, and modify that Content to develop your Product as outlined above, and for no other purpose.