Missing Submit Button

[wilkls]

I created an assignment using the Google Cloud Assignment option.  My students were all able to open it and work, however, several are missing a submit button.  Can anyone tell me why a few wouldn't have the option to submit?  They can open the assignment and work on it, but have no way to submit it through canvas. 

Thanks

[sjones11]

What browser are they running?  Many times updating Chrome (for example) and clearing out the browsing data, maybe followed by a restart alleviates weird issues like that.