Improve flexibility of UFileUpload

[qlampa]

Package

v4.x

Description

Currently the capabilities are severely limited to using a File instance as a model value. If we need to "update" files (for example, some files are URLs, while others are actual File's), which is pretty common use-case (e.g. avatar, product images etc), the current implementation doesn't provide a way to do so. This is also impossible with slots as they check for the presence of items and prevent the slot from rendering if they don't exist.

Additional context

No response

[vachmara]

While trying to build this component, I remember proposing a custom file type. Could that be something that would solve this issue? @qlampa

[qlampa]

@vachmara
yes, this seems like a possible solution, but would this let us render previews by URLs?