What is Reddit's opinion of Marta?
From 3.5 billion Reddit comments

➔ Marta website

By popularity on Reddit, this Service is:

#123 in File Manager apps

1 review of this app found across Reddit:

https://marta.sh looks promising.

Disclaimer: I just found it and I am wholly unrelated to it.

As with every software from the internet I am not responsible if it explodes your computer or decides to rickroll you and/or worse.

It didn't for me but YMMV.