file:// uris not supported

[SnarkyCarbivore]

UriLoader goes to the StorageFileLoader for URIs prefixed with ms-, but uses the normal UriLoader (which leverages HttpClient) for everything else. This does not work for file:// URIs, which should be loaded with StorageFile.

While I can use the SetSourceAsync(StorageFile) to set the lottie in the file:// case, it would be more convenient if I could just pass in the URI regardless--and when using the StorageFile version of SetSourceAsync, the UriSource property of the LottieVisualSource remains null, so I can't use it to check if there is currently a lottie assigned.