Steps to reproduce

1. Enable UTF-8 support by setting magnolia.utf8.enabled = true in magnolia.properties.
2. Upload an image containing an Umlaut (e.g. ä) in its name to assets. Make sure the Umlaut is non normalised. E.g. ä is encoded as \x61\xCC\x88. (see also info.magnolia.cms.util.UnicodeNormalizer).
3.  Add the uploaded image to an image component in the pages app.

Expected results

The image displays in the image component.

Actual results

The image is not shown in the image component and a javax.jcr.PathNotFoundException  logged.

Development notes

Magnolia normalises URIs to NFC form internally. The assets app however accepts non NFC forms for asset names, which makes such assets inaccessible. (See info.magnolia.cms.filters.UnicodeNormalizationFilter).

Environment

I was able to reproduce this on OSX with Firefox. Other environments might behave differently depending on how file upload deals with encoding of the filename.