[Q] How to transfer files while stuck in recovery mode topic

So I flashed a custom recovery today and accidentally wiped everything, including the ROM file I had copied over while I still had my previous ROM. Problem is, I have no idea how to get the ROM file onto the phone now. Usually I use my microSD card but for some reason no recovery will recognize my card (tried mulitple recoveries, and cards, probably a problem with the slot) and now I have no way to get a file onto my phone. I tried using the USB mount but when I click it nothing happens on my computer. So how do I get my GAPPS and ROM onto my phone so I can flash them? Thanks!