We maintain a growing YouTube channel and almost never use our phones. However, cell phones CAN produce some pretty stinkin’ high-quality video if you let it. Especially with lens attachments for the iPhone, there’s a lot that can be done.
That said, we use a Sony system consisting of an A6300, 18-105mm f/4, a Rode VideoMic Go microphone and a lapel mic. I edit and upload our own videos using Adobe Premiere.
All in, we’re probably around $2,000 deep. A lot of people spend WAY MORE than that, but that doesn’t necessarily mean they are getting better quality. I’m a firm believer that the camera doesn’t matter for 99% of what you’ll shoot. You control the quality, especially on YouTube. Oh, and audio is a huge component of video production that most people ignore or forget about, but it makes a huge difference in the final product.
To share a video…as long as it’s not too big, I suppose you could use something like Dropbox? I’ve never shared video like that before, so I’m probably not the best person to answer that particular question.