I just did a fresh install of Pydio 8 via the deb/apt repository and Ubuntu 16.04. This problem so far is on Chrome 64.0.3282.186 on MacOS 10.13.3 and in Chrome on Android. I briefly tested with Firefox and it was worse.
In the browser you can play individual files with the play icons. However on Android it will bring up the player with all the tracks.
This player won’t allow you to stop or pause the track. You also can’t switch tracks. And if you try to close it, it will continue to play. There is a mini icon at the bottom that gives you some control. Or you can switch tracks in the player and hit play via the mini-icon.
Here is the link to see what I am talking about with my installation.