How to upload a simple file via ACF to REST API

[ServiceSector]

Steps to replicate: -Made sure that uploading file is possible via /wp-json/wp/v2/media/ POST reference -On postman, /wp-json/acf/v3/users/140/ POST with body set as form-data, keys being fields[imagefield] and value being a file sample.jpg I get cannot update item status 500

I'm certain that it's a simple mistake, something small, not sure what though