Each Android device acts differently from another.
The best way to download files to your phone is Using Chrome browser, if clicking on download button does not make anything happen, try long press on the download button and "Save Link"
Unfortunately, Downloading MP3 files directly is not possible in Apple iOS devices.
Luckily, there are a few apps that support downloading files like Downloader and Documents by Readdle.
Another Option is to save files to the cloud (Dropbox, Google Drive, iCloud) from a PC and stream the music from your phone.
When clicking the download/convert button a small window will open and a loading carrot will show,
please wait till the loading complete and the window will show you the "Download Now" button
If you still can't download the file or the process is stuck at some point, please contact us