Is it possible to get metadata (author, content) about an uploaded file?

At this time, this reference is not known from the perspective of the file. Could you explain the use case a little more? I may be able to provide more help if I understood what you want the content/author information for.

This data is necessary for subsequent notification of the end of video file processing.

Use case

1. Through RTE the user uploads the file from any available content type (media gallery included)

2. This metadata is saved in the database (link to video, userId, contentId)

3. The file is being processed

4. The end-user is notified by mail or through toasts about the end of processing.

That way, the user will be informed and able to navigate to that content item (from a toast or a link in a email) to make sure the video is displayed correctly.

This data is necessary for subsequent notification of the end of video file processing.

Use case

1. Through RTE the user uploads the file from any available content type (media gallery included)

2. This metadata is saved in the database (link to video, userId, contentId)

3. The file is being processed

4. The end-user is notified by mail or through toasts about the end of processing.

That way, the user will be informed and able to navigate to that content item (from a toast or a link in a email) to make sure the video is displayed correctly.

Our video transcoding file viewer supports this behavior by handling the CentralizedFileStorage events to detect new/changed supported files then captures the accessing user and logs the file-user association. It then uses this association to notify the user when transcoding is complete.

APIs used:

•  CentralizedFileStorage In-Process API Service -- file create/update/delete events to log user associations
•  User In-Process API Supplementary Type -- to get the accessing user