API/Storing-Files.md

@@ -30,6 +30,19 @@ In the universe, an attribute can be identified as being a file by it's baseData
 
 The attribute's permissions are handled as usual - if it's available in a transition, it may be set.
 
+## File Types
+
+Currently, three types of "file" attributes are supported: file, picture, video. They only exits for semantic reasons and not actually handled differently in any way.
+
+In the universe, an attribute which needs to be handled by uploading a file has
+
+```
+"baseDataType": "file"
+```
+
+
+https://git.ironapi.com/ironapi/api/-/wikis/API/Form-Input-Types
+
 ## Upload
 
 To set (upload) a file, it needs to be packed into the json request of any transition which includes it.