Adding files in the packaging tool UI is horrible. You can only add a single file at a time. The file picker needs to be enhanced to allow multi-selection. Also consider drag and drop onto the file listing surface.
I've tried to add icon files to the Assets folder using the Package editor and found that the files I added were not saved. What gives?
I may be confusing my packaging tools, but possibly the file needs to exist on the same partition that you are packaging on to perform the import.
I was unable to replicate your issue of adding files to the assets folder. If this issue persists for you, could you please file feedback so we can investigate? You can file feedback using the Feedback hub (windows key + F) under Apps > MSIX Packaging Tool.
Multi-selection is now available for adding files within the Package Editor as of Version 1.2020.709.0.
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