Get a signed URL to upload a new photo
Object uuid. This field is optional and only needed when you want to add a new image to an existing object. This ID could correspond to a proposal, comment, PBCycle or other type according to object_type field.
Image type to upload. In the future this field can change to cover other scenarios.
Type of object to which the image will assigned.
PB Cycle on which the proposal is going to be created if doesn't exist.