Hello there, @xinxingrtps ...
I am reviewing some of the older questions here in the Canvas Community, and I stumbled upon your question. I wanted to check in with you because I noticed that there hasn't been any new activity in this topic since your posting on March 25, 2019. It looks like @rmurchshafer had been helping you with your question about files and then also getting logged in on your mobile phone. Were you able to get logged in? Also, did Rick's response about those image files help to answer your question? If so, please feel free to mark his feedback as "Correct". But, if you are still looking for some help from Community members about your original question, please let us know that as well by posting a note below. For the time being, I am going to mark your question as "Assumed Answered" mainly because there hasn't been any new activity in this topic since late March. However, that will not prevent you or others from posting additional questions and/or comments below that are related to this topic. I hope that's okay with you. Looking forward to hearing back from you soon.
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