Earlier quoted context omitted.
The number one reason I don't use Google Gemini is because they truncate the input text. So I can't simply paste long documents or other kinds of things as raw text in the prompt box.
If you have the need to paste long documents, why don't you just upload the file at that point?
It's basically what I've come to expect from most Google products at this point: half-baked, buggy, confusing, not intuitive.