hello: in the space below where it says (you know the solution) you have a box with a small image ... clicking here you will see the images that you have on your pc ... next to it you have another square like a clip where it says ( attach files) ... by clicking there you will see the files that you have on your pc ... also to upload a file to send to another colleague in the spaces, they are for comment you can use the mediafire page ... you must download the mediafire page in the free option ... you must register .., greetings! https://mediafire-desktop.softonic.com/