To upload a file, go to the top menu bar and click on the three dots located on the right. Then, select the 'Upload' option from the dropdown menu.
A popup window will appear, allowing you to choose the file you wish to upload. Click on the 'Open' button to start the uploading process. Please note that the waiting time will vary depending on the file size and your internet speed at the moment of upload.
Once you have selected the file and waited for a few seconds, the file will be uploaded to the server and will be ready for use.