Polyline annotation allows to draw shapes and freehand lines
API usage There are steps that usage of GroupDocs.Annotation Cloud consists of:
Upload input document into cloud storage and other files, like image annotation (using File API) Add annotation(s) Download document with annotations (using File API) HTTP POST ~/annotation/add Swagger UI lets you call this REST API directly from the browser.
cURL example Linux/MacOS/Bash # First get JSON Web Token curl -v "https://api...."grant_type=client_credentials&client_id= $CLIENT_ID &client_secret=...&client_secret= $CLIENT_SECRET " \ -H "Content-Type: application/x-www-form-urlencoded"...