I teach a course at Stony Brook University via Zoom. I am using Linux Mint 64-bit versions for both the OS and Zoom app. I used to be able to place .pdf files in the chat window for my students to download with no problems for the last two years. However, in the last two weeks, whenever I do that, Zoom immediately crashes.  Your automatic helper keeps referring to share screen crashes, but I don't have a problem with screen sharing. Also, I am definitely not using the 32-bit version.  I'm beginning to suspect it could be the Linux kernel. I must be able to place .pdf files in the chat window, as I used to be able to in order to teach my course.  I need immediate advice or help. I've sent crash reports as requested after the crashes.