Which form must sellers complete and sign before uploading property information online?

The correct answer is the MLS Profile Sheet. This form is essential because it is specifically designed for the listing of a property in a Multiple Listing Service (MLS). When sellers wish to broadcast their property information online through an MLS, they must complete the MLS Profile Sheet, which captures crucial details about the property, such as its features, pricing, and other pertinent information that agents and prospective buyers will view.

In contrast, while the Seller's Disclosure concerns the condition of the property and is vital for transparency between buyers and sellers, it is not directly associated with the uploading process in MLS. The Property Listing Agreement is a contract that establishes the relationship between the seller and the real estate broker, but it doesn't specifically pertain to the online listing format. Lastly, the Comparative Market Analysis is a tool utilized to evaluate the value of a property compared to others in the market, but it does not serve as a form for uploading property details to the MLS. Therefore, the MLS Profile Sheet is the required document for this process, ensuring all relevant information is systematically organized for public access in the MLS environment.