They can put the code into a separate repl and run the code there, as the link would work. This is a compatibility issue between the old repl.it IDE on Classroom and the new repl.it IDE on the main site. There are in fact plans to update the Classroom IDE in the future, but for now I suggest using the regular IDE to copy+paste to and from to Classroom.
If I answered your question: https://answered--vandesm14.repl.co
I have come back to this problem. I wish to send my students a html file with an image. I have created a separate html file for the students to do this. The file is in the IDE and not classroom. I have shared the file and it seems that the students can write over it. I have tried to make it private and share it and still the student seems to be writing over it.
Here is the link
What would be your suggestion to this problem. Thank you.