Comment Uploads allows you to give your users the option of uploading and attaching files or images to comments upon submission. Comment Uploads integrates very nicely into the native EE Comments module and has a good handful of variables for power and flexibility.
Comment Uploads by Solspace, Inc. is a discontinued product and is provided here for free to users that wish to still use it. USE OF COMMENT UPLOADS FROM THIS REPO COMES WITH NO SUPPORT OR GUARANTEE THAT IT WILL WORK. WE WILL NOT UPDATE THIS REPO OR ACCEPT ANY PULL REQUESTS.
Last ExpressionEngine versions known to work on is EE 2.11.x and an experimental unnoficial version for EE 5.x (see ee5 branch).
Documentation can be found here: https://solspace.com/expressionengine/legacy/comment-uploads