Trying to move an mp3 but it just keeps playing

I want to use an mp3 as a custom ringtone, so I know I need to move it to my ringtones folder. I got it onto my phone using Google Drive, so it's currently in my downloads folder. I'm trying to move it to the ringtones folder using a file manager app that I saw recommended in another tech support program, but every time I select the mp3, rather than showing me any options for moving it or copying it it just starts playing the mp3. The app is just called File Manager and it's by ASUS.

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