seems extremely limited

I would like to transfer all kinds of files from and to this device. The only thing I can figure out is pix and vids, not PDFs and audio and docs. The manual is useless and ther is no web presence (that I can find) to look or ask for more info. All the You Tube vids show you how to transfer photos, nothing else.(except one guy that wanted to show you a vid of his cat!) If anyone out there knows of a way, or maybe a different app to use, please post it here, please...

HaloDeb about i-easydrive, v4.2