Fix Website/Configuration - Cloud Storage Website -- 2

I am looking for a web designer/programmer to fix my cloud storage website. Its called VaultLocke. I have both a web version and an android app made in flutter. I need you to make sure both are fully functional. App source code will be provided. Issues with the website: 1. When uploading files, some thumbnails show and some dont. I need all files show the thumbnails and not broken images, example shown in the screenshots. 2. I need you to incorporate X-SendFile or X-Accell to help reduce server memory and CPU usage. 3. Some uploads fail and some go through. 4. Very slow upload speeds. 5. Big file uploading tends to fail. **access to the server & website will be given to the freelancer after he/she has been awarded. **This was a codecanyon bought script called bedrive. if you need to check it out, search it on [login to view URL] **your bid is the project's final cost so bid accordingly. looking foward to working with you.