Hello! To download a file from your Azure hosted app service, you can use FTP or FTPS. Since you mentioned that you are already using FTPS, I can guide you through the process of downloading your SQLite database file.
First, you need to find the path to your SQLite database file. You can do this by logging in to the Azure portal, navigating to your app service, and then going to the "Advanced Tools" section. From there, click on "Go" to launch the Kudu console. In the Kudu console, navigate to the "Debug console" and then select "CMD". Once you are in the command prompt, navigate to the "site" directory and then to the "wwwroot" directory. Your Django app should be located in a subdirectory of "wwwroot". Once you find your app directory, navigate to the directory where your SQLite database file is located. You can use the "dir" command to list the files in the current directory.
There should be a download button in the UI. Please try this and let us know the outcome.