Streaming audio problems

[howpix]

A year ago I created some audio files online along with QR codes that pointed to them for my teacher wife. A kid would point her Lucid to the QR Code which took the kid to the audio file stored on line and played it. She needed it done again this year but when I read the QR code, it goes to the file but only plays the last few seconds of it. If I manually enter the URL in the Browser on the phone, it goes to the site, asks to play the file and there is a huge delay (minutes) before it does play it . . . in its entirety. Neither of the above options are acceptable for the use for which she needs the playback. The file plays fine on an iPad both via Firefox and a QR reader. It also works fine on a Mac and PC (desktop and laptop) when I type the URL directly into Firefox, IE and Safari. I do not own an iPhone but I suspect it will work as well as the iPad. And, as I said, it worked a year ago on the Lucid.
I've rebooted the phone, removed the battery and let it sit for a half hour (excessive but I was doing other things), restarted it, etc. No change at all.
Any thoughts or trouble-shooting tips? I cannot post the QR code or link (too new an account to post images or links) but I don't think the file itself is at fault as I have tried different files (different lengths, data rates, etc.) on recordmp3-dot-org and on dropbox with the same results.

 

[Rukbat]

Where are the files stored online and how are they stored?

What WAS the default audio player last year and what IS the default audio player this year? If it's the same one, has it been updated since it last worked? If so, do you have an apk file (a backup) of the version that worked?

 

[howpix]

Files are stored on recordmp3.org and dropbox.

Playback automatically starts so it is built into Android OS. The phone has upgraded since last year and as we all know, one cannot downgrade an Android phone. So not sure that's an option.