[Review] 289 - As an artist, I want to receive a warning when I try to upload the wrong file format, so I can publish the right one.

[brenno-silva]

Description

This pull request adds a validation on the objects upload to avoid wrong file formats to be used.

Resolves (Issues)

#289

General tasks performed

• Added a validation based on the file format of the file uploaded
• Refactored the Edit object's page to standardize the file handling

Have you confirmed the application builds locally without error? See here.

• [x] Yes