This should be tested on at least 1 iOS device and 1 Android device.  Ideally it should be tested on an Android device which uses a storage quota, and one without (see comments).  You will need a enough files to fill up the device's available storage. All devices should have access to WiFi and mobile data. Create a course containing a resource with a small file (<10MB), a resource with a medium file (between 10 and 100MB), a resource with a large file (>100MB), and a resource with a very large file (> 300MB). Open the app on the device and go to the course. Ensure WiFi is turned off, but you are still online using mobile data. Attempt to download the small file. The file should download with no prompting Attempt to download the medium file. You should see a confirmation dialogue with the following message: "You are not currently connected to WiFi. You are about to download [size] . You currently have about  [available] free space. Are you sure you want to continue?" Confirm the download The file should download Attempt to download the large file. You should see a confirmation dialogue with the following message: "You are not currently connected to WiFi. You are about to download [size] . You currently have about  [available] free space. Are you sure you want to continue?" Confirm the download The file should download Delete all downloaded files Turn WiFi on Attempt to download the small file. The file should download with no prompting Attempt to download the medium file. The file should download with no prompting Confirm the download The file should download Attempt to download the large file. You should see a confirmation dialogue with the following message: "You are about to download [size] . You currently have about  [available] free space. Are you sure you want to continue?" Confirm the download The file should download Android device without storage quota: Fill up the device's storage so that the reported free space is less that 60MB. Attempt to download the medium file You should see an alert with the following message "You are trying to download [size] . This will leave your device with insufficent space to operate normally. Please clear some storage space first". The file will not download. Android device with storage quota: Fill up the device's storage to the quota limit (you can verify this because you will get a "remote write failed: Quota exceeded" error when trying to copy a file with `adb push`.) Attempt to download the large file. You should see a confirmation dialogue with the following message: "You are about to download [size] . You currently have about  [available] free space. Are you sure you want to continue?" Confirm the download The file will start to download, then you will see the following error:  "Your device could not allocate space to save this download. It may be reserving space for app and system updates. Please clear some storage space first." iPhone: Attempt to download the large file You should see a confirmation dialogue with the following message: "You are about to download [size] . Are you sure you want to continue?" Fill up the device's storage so that there is less than 600MB free. Attempt to download the very large file. You should see a confirmation dialogue with the following message: "You are about to download [size] . You currently have about [available] free space. Are you sure you want to continue?" Fill up the device's storage so that there is less than 500MB free. Attempt to download the large file You should see a confirmation dialogue with the following message: "You are about to download [size] . You currently have about [available] free space. Are you sure you want to continue?" Fill up the device's storage so that the reported free space is less that 60MB. Attempt to download the medium file You should see a confirmation dialogue with the following message: "You are about to download [size] . You currently have about [available] free space. Are you sure you want to continue?"