First of all – Don’t worry it’s pretty easy!
Pointly will work with the data format LAS or LAZ. The preferred upload format is LAZ because of its compression, followed by LAS.
Excurse: A LAS (LiDAR Aerial Survey) is an open and binary file format which stores LiDAR point cloud data and a point classification system. It is specified by the American Society for Photogrammetry and Remote Sensing (ASPRS) and its latest Version is LAS 1.4. The purpose of LAS is to function as a standard format between LiDAR tools, including hardware and software. It is seen by the majority as an industry standard for LiDAR data.
Whereas LAS is probably the most used data format for the work with point clouds, there are as well a couple of different formats, like ASCII or PLY. If you have your point cloud data in a format different to LAS, there are some easy ways to convert your specific point cloud format to LAS or LAZ. For example open source solutions like CloudCompare, LASzip or PDAL help you to achieve this within very few clicks.