Jpa archive deleted after uploading

I have no idea what that means. Googling it only resulted in 5 hits for me, the first one being this topic.

If you want to install a new Joomla site, by far the easiest way is to use our Softaculous installer, which you can find in the control panel. You can also attempt a manual install by uploading the Joomla core files yourself, roughly following the official installation guide from Joomla along with our guides on [how to upload files with FTP(How to upload files with FTP) and how to setup a MySQL database.

If you are migrating an existing website, you can do that by moving the files and database of your website manually. This is the method described by Joomla and by us. Using backup/migration plugins is discouraged because of file size limits and PHP execution limits.