Is Share option present in Groove
Yes there is a share option built into the Groove music player. But, the share option in Groove is a URL/link sharing option and not a file sharing option. Below is the changelog related to this option, when the feature arrived to Groove in version 3.6.2142
Copy links to songs, albums, and artists right in the app so you ...
Follow these steps:
Click on System
Select Groove Music
Click the Advanced options link
Click the Reset button
Click Reset one more time to confirm.
Using the reset feature will delete all the app data on the device, including preferences and sign-in details.
Toggle the repeat icon to your desired preference. If you want it to repeat a playlist or all songs, touch it once and it should highlight that its active.
If you would like to repeat one track, click on it again, and it should show you a tiny 1 superscript on the icon, to signify that the player will be repeating/looping one track:
There are multiple ways to do this. Some are:
Add the song to a playlist and play that list.
Tap repeat until Groove repeats only one song.
Create a single album
Since you have the music file you can edit its info and create a single album for that song yourself. Then play that album.