Zoho Projects allows you to browse and upload your files from your personal desktop, Zoho Docs and Google Drive, SkyDrive and Dropbox. You can upload any file type like *.jpg, *.png, *.doc, *.docx, *.ppt, *.xls, *.csv, *.mpeg, *.zip, *.mpeg, *.wmv etc.
Go to Documents Tab and select Files link from sub-menu

Click Upload New File button from the top panel

If you wish to notify your team members about the uploaded documents in the project workspace.
This uploads the attached files and saves it under the selected folder. In addition, it notifies about the documents being uploaded into the workspace to selected coworkers (if document notification is selected).
Note:

You can upload files from your Zoho Docs account into your Zoho Projects workspace.
If you wish to notify your team members about the uploaded documents in the project workspace.
This uploads the attached files from Zoho Docs and saves it under the selected folder. In addition, it notifies about the documents being uploaded into the project space to selected team members.

You can upload files from your Google Docs account into your Zoho Projects workspace.

If you wish to notify your team members about the uploaded documents in the project workspace.
This uploads the attached files from Google Drive and saves it under the selected folder. In addition, it notifies about the files being uploaded into the project workspace to the selected list of members.

You can upload files from your Google Drive account into your Zoho Projects documents area. But linking files from Google Drive is enabled only for Google Apps Users
Steps to link a file from Google Drive :

You can upload files from your Google Drive account into your Zoho Projects documents area. But linking files from Google Drive is enabled only for Google Apps Users
1) Attach files from your Skydrive account :
Click Skydrive link present in the Upload New file form.

This displays the autheticate dialog you need to authorize your Skydrive account so for this Click Authenticate SkyDrive button

Once done, it will redirect you to the login page. Provide your login credentials for your Skydrive account.

After logging in select the required files to be imported into Zoho Projects and Click Done selecting files button. This loads the selected files into Zoho Projects documents area and notifies all team members.

2) Attach files from your Dropbox account :
Click Dropbox link present in the Upload New file form.

This displays the authenticate dialog you need to authorize your Skydrive account so for this Click Authenticate Dropbox button

After logging in select the required files to be imported into Zoho Projects and Click Done selecting files button. This load the selected files into Zoho Projects documents area and notifies all the team members.

Upload Files | Move/Delete Files | Organize Files | Version Files | Dropbox Integration