1. Choose the channel you need add file to.
2. Click on Files tab at the top of the window.
3. If you need to create a new folder, click on +New and select the Folder option.
4. Create a name for the Folder you are making, then click Create
5. Navigate to the folder where you need to upload your file.
6. Click on on the Upload option and choose whether you wish to add individual files or an entire folder.
7. If you are just adding individual files, click on Files. This will open a File Explorer window on your computer. Navigate to the file you wish to upload.
8. Select the file you want to upload then click open.
9. Your file will then be uploaded to that folder.