Do the following to attach a file or web link:
Open the desired screen, say Project.
On the grid, select a project record.
Click Attachments.
On the Attachments screen, click Add File or Add Link to add a file or a web reference to the record.
Next, click Browse to choose a file to upload and then click Attach to save it to the default file location. In case of web links, you can copy-paste that in the field provided.
When you have finished, click Close.