Graphene Workflows: A clear error status or an info text is needed for the Graphene Workflow file uploads

[alikemaltanriverdi]

Is your feature request related to a problem? Please describe.
We have been receiving support requests from several end users regarding not being able to upload the files in Graphene Workflows. Since the only indication to unsuccessful file uploads are the "X" marks on the file image in the file management sections in the workflows, users are not able to resolve this issue on their own.

Describe the solution you'd like
A clear indication on why the file upload failed, such as "Exceeding file limits, the file limit is 10MB", "Unsupported File Type", etc. would help the end users to understand why the upload failed, and they might reduce the file size (or take the other required actions) without the need to contact to HelpDesk or other support personnel.

Additionally, an info text can also be used for file upload sections to indicate the currently allowed file upload limits or the allowed file types, so the users can see the limits and adjust their file size before receiving the errors suggested above.

Additional context
Even though the file uploads related requests are not very often, I believe that the solution suggested above would help the end users to have a better user experience.

Please see the current file upload error in the screenshot:

Please let me (@alikemaltanriverdi) know if you require any additional documentation or more detailed explanation.