USB memory stick undetected by Samsung Galaxy G5 Mini According to this video on YouTube, I should be able to connect a USB memory stick directly to my Samsung G5 Mini, and the phone should automatically detect it. But if I try this with a USB 2 memory stick and cable, my phone does not detect it?

Why? Can anyone advise?

My phone runs Android 4.4.2 and is a model SM: G800F.
Sounds like you have an OTG cable, but you also need to download and install an OTG driver.  I think I found mine on the Samsung website, in the phone download section.