I have managed to show a progress bar when the form is submitted.
Pending tec...

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I have managed to show a progress bar when the form is submitted.

Pending technical debts:

  • Currently, the ajax command libraries are loaded inside WidgetBase. I believe they should be loaded as part of DisplayBase, or somewhere else in the stack.
  • Similarly, I found that the current ajax submit callback can be easily removed, or can be moved to somewhere else in the stack.

Pending work:

  • It works if you have selected an existing media entity, but breaks when a new entity is selected.
  • Implement progress status callback.
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