File to Base64 with Kastri TFilesSelector [closed]

  

I want to allow the user to select a file on his mobile device. Since TOpenDialog is for PC only, I use the library Kastri. But TFilesSelector returns the filenames selected by the user like this:
content://com.android.providers.downloads.documents/document/4728

How I can

Get the real filename (ex: "test.pdf")?
Get the content as TStream to convert it to Base64 and then upload it to the server?

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