As long as the image is exactly 100x100 and doesn't need to be resized when used as your avatar, it should remain transparent when uploaded. If I'm being honest I'm not really 100% sure, but I know with non-gif avatars, if you upload a transparent image that's bigger than the 100x100 default size, it'll resize to 100x100 and lose transparency, so I'm assuming the same applies to gifs.
There's also no need to bump up your questions when they were only asked ~3 hours ago. If it's been a few days and you've not received a response, then feel free to bump it. If it's only been a matter of hours then just leave it and someone will answer it eventually
thank you! I'll try uploading as it is, then.
sorry for bumping, I just thought since my post was at the bottom of the page it might not get noticed