Description: Add a feature that allows administrators to restrict the types of files that can be uploaded in forms. For example, administrators should be able to specify that only PDF files are allowed to be uploaded to avoid issues with incompatible file formats (e.g., .jpg or .png). This could be done inside of the Form Editor. Problem: Currently, users can upload any type of file, which causes issues when the system only accepts certain file types (such as PDFs). This requires manual intervention to convert files, leading to inefficiencies. Example Business Case: To process receipt submissions for reimbursements, the system only accepts PDFs, which means staff members are forced to manually convert image files (.jpg, .png) into PDFs, which is time-consuming and error-prone.