Material Files?
It’s broken for me lately and is the reason for this post
What does not work? I use it everyday and it works flawlessly 🤔
It seems actively developed. Is your issue in the tracker?
Ghost Commander may work for this. I’ve not tried sftp myself, but on opening it I do see the option there, so it might be worth a try.
Yes! Ghost Commander is open source and it’s able to transfer via sftp
Does Termux count?
I don’t know if it’s open source or not, sorry, but I use MiXplorer and it does everything I need, including SFTP.
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I use File Manager + https://play.google.com/store/apps/details?id=com.alphainventor.filemanager