A model review is easier to follow when a question points to a specific location. Add a numbered note such as “Confirm whether this hole needs a thread” directly to the model, then send a viewing link with the saved notes.
Open the annotation workspace, upload a supported 3D model, and open More → Annotations if the panel is closed.
Place a review note
Choose Add annotation, click a point on the model surface, enter your comment, and choose Save annotation. Dragging still moves the view; placing a note requires a click. Notes are attached to a component's local coordinates, so their markers follow that component when the model moves or explodes.
The annotation panel lists numbered comments. Select a comment or its marker to return to the recorded viewing direction and zoom. Locating a note reveals its component and turns off section clipping so the location can be inspected. Edit or delete notes from the list.
Save before sharing
Private notes are stored in the current browser for that temporary model. Clearing browser storage removes that private copy. A new upload is a different model record, even if the filename is identical. The current limit is 50 notes per model view, with up to 1,000 characters each.
Open a single model in View mode before creating a share link. Saved notes for that model are copied into the share snapshot. Recipients can read notes and return to their viewpoints, but cannot edit the sender's snapshot. Existing links do not change when the sender edits local notes; create a new link to send a revised review.
Share access, password protection, expiry and revocation use the same controls as the model itself. Annotation text is not included in the public social preview or exported model image.
Keep a draft if saving fails
If local storage is unavailable or another tab has changed the saved record, saving stops and the current draft stays in the panel. Use Export annotations to download the notes and draft as JSON before reloading. This is a backup export; importing that JSON is not currently supported.
Current scope
This release supports model-anchored text, recorded viewpoints and immutable share snapshots. Persistent dimension lines, rectangles, circles, freehand redlines, replies and live collaborative editing are not included. A text note describing a dimension is not a measured dimension and does not replace a controlled engineering drawing.
Original article: CADProps · https://www.cadprops.com/guides/annotate-cad-model-online/