Does the USB type A slot support reading files from a memory stick or portable storage device?

Yes. Supported formats are as below.

Video: MPEG1, MPEG4, H.263, H.264, H.265, Motion JPEG

Audio: MPEG1/2 Layer1, MPEG1/2 Layer2, FLAC, MP3

Picture: JPEG Baseline, JPEG Progressive,  PNG non-interlaced, PNG interlaced, BMP