Recognizing USB

[NEYankee]

Not having much luck in being able to use a USB. Have downloaded guest additions iso from oracle and tried the insert guest additions w/no response from VB. Have windows based software that is on flash. Using high sierra on Mac

[socratis]

Have downloaded guest additions iso from oracle

Maybe you mean the Extension Pack? You've got to be careful with the terminology. There are two distinct things:

• The Extension Pack (ExtPack) gets installed on the host and it has to match the VirtualBox version. It provides functionality such as USB2-3, Webcam, VRDP, PXE, PCI passthrough on Linux hosts, VDI Encryption. You have to download it and install it separately from the main VirtualBox program, due to its license.
• The Guest Additions (GAs) get installed on the guest and it would be good to match the VirtualBox version, for anything other than enhanced graphics support. It provides functionality such as shared folders, shared clipboard, drag and drop, pointer sharing (for PS/2 mice), enhanced graphics support. You do not have to download it separately from the main VirtualBox program, since it comes bundled with it.

As for the USB, please read the following thread: USB basics and troubleshooting, all of the posts. If you still have a problem after reading through the whole thing, please follow the advice of the last post, #8: Asking for help and post the information requested.