The image url is encoded since #589 Valid Image Url https://firebasestorage.googleapis.com/v0/b/jagyeok-001.appspot.com/o/exam001%2Fexam001_687_2a0829c9-0349-425e-8615-a309d9d6fbca%7D.png?alt=media&token=17242a6e-ba12-47a6-a567-2f7b88c34229 Transformed Image Url https://firebasestorage.googleapis.com/v0/b/jagyeok-001.appspot.com/o/exam001/exam001_687_2a0829c9-0349-425e-8615-a309d9d6fbca%7D.png?alt=media&token=17242a6e-ba12-47a6-a567-2f7b88c34229 `%2F` is converted to `/`. It is a misbehavior. This should be correctly shown in [commonmark spec](https://spec.commonmark.org/dingus/). 