Can I attach documents (e.g. PDFs) to a point cloud project?

You can attach arbitrary documents to a point cloud by adding one or more Document datasets to the point cloud. These documents do not get processed in any way - they are simply stored as file attachments that are associated with the point cloud. A typically example of using a document would be to attach a PDF containing a statement of accuracy or capture methodology to a point cloud.

Adding a new Document dataset to a point cloud

When viewing your point cloud, click on the Projects (1) tab located under the 3D viewer, and then select the New dataset (2) button.

Then firstly select the Documents option in the dataset GUI and click Next. 

Fill out details for the document's properties (1). You can directly upload the necessary documents, whether they be PDFs, CSVs etc... (2). Complete the other options provided for the dataset such as viewability and notifications (3). Finally click Create and it will be added to the point cloud's datasets'. (4)