In Android Studio the characters used for file names are strict. If I remember correctly, you can not use space, hyphen or anything else except English language alphanumerics (letters and numbers).
How about in Defold? I tried adding an .ogg file with space and I could not use it as it did not show up when adding a trigger for sound. In the file name I removed anything that was not alphanumeric and then it was possible to use the music file.