TiddlyDesktop having trouble supporting other image formats

[NebulaFox]

Only know for external image

Steps to Reproduce

1. Have a image format not listed on under type, in my example i have a tiff image
2. Add _canonical_uri to fields (which isn't listed)
3. Set type to image/tiff
4. Check uri is correct by clicking
5. Save

Expected Results:

See the image

Actual Results:

Trying to load external content from path/to/image.tif

If this message doesn't disappear, either the tiddler content type doesn't match the type of the external content, or you may be using a browser that doesn't support external content for wikis loaded as standalone files. See https://tiddlywiki.com/#ExternalText

[Jermolene]

Thank you @NebulaFox. This is actually not specific to TiddlyDesktop and so should be an issue for https://github.com/Jermolene/TiddlyWiki5. Hopefully I should be able to copy it across.