How can I cast a video file that has been downloaded onto an iPad to a chromecast I have sent several video files to my mom, who has downloaded them onto her iPad.  She has the video files saved on her iPad into a directory called &quot;my files&quot;.  She recently bought a chromecast so that she can play these files on her TV, however all the apps she has tried only allow her to select files from the camera roll, and not the video files she has downloaded.

Is there an app that will allow her to cast video files from locations other than the camera roll?
If not, is there a way to move the downloaded files into the camera roll?

She has tried an app that mirrors her screen to the TV but the quality is really bad, and the differences in aspect ratio make it so that you can't go fullscreen.
She can use the Files app on the iPad to copy the files into Photos (what you call the camera roll). Simply open Files, navigate to the &quot;my files&quot; directory, tap on the video and press the Share icon (square with arrow pointing upwards). In the Share sheet she should select &quot;Save video&quot;. This stores a copy of the video in Photos.
A different approach is to install a video player app such as &quot;VLC&quot; from the App Store. Now in the Files app, open the share sheet for the video and select to share it to VLC. Now it will play in VLC and you can tap the Chromecast icon to get it on the TV.