Quoting snippets of relevant text is fine, but fully quoting embedded images / videos, etc is discouraged in the software for a reason. It adds a bunch of repetitive, highly disruptive visual noise to the topic.
Same reason that “inception” style quoting is discouraged. No sane human mind wants to read
You done been inceptionated!
It is allowed in the sense that cutting yourself is allowed. We can’t stop you. You’re an adult. But is it a good idea?