I'm using Bluestacks and I want to upload some pictures to Instagram but I get a message that the SD card is full. How can I delete files from the SD card to be able to upload pictures using a Mac?
It doesn't matter if you have Windows or Mac, you can manage the files on the SD card using the application you install in the Bluestacks application. If you have added a Google account, install ES File Manager and then you can manage all the files. Practically, the ES File Manager allows you to delete files from your SD card.
ES File Manager: https://play.google.com/store/apps/details?id=com.estrongs.android.pop&hl=en
There is no other way to manage files from Mac.