After the authorisation process, the next step for e-filing is to Upload data to MTDVAT for e-filing. Follow the steps :

RoadMap of Uploading Data in MTDVAT -

Step 1. Click the hamburger menu on the top right corner of MTDVAT application.
Step 2. Click on “Upload Data & Status” sub menu. 
Step 3. You will be redirected to a page with “Download Template ” -> “Upload Data Status” and “Upload Data”.
Step 4. Under "Download template" choose "MTDVAT", which directs to a page with " Download Spreadsheet" and "Download Instructions" in it.
Step 5. After clicking on both of these, a “spreadsheet” file and an “instruction manual” will be downloaded
Step 6. Complete the downloaded spredsheet with all the details of your VAT return and save it in "CSV format" . 
Step 7. Now, go to "Upload Data "  to upload the data to MTDvat.
Step 8. After uploading, to view the status of uploaded data . Click on "MTDVAT"  under 'Upload Data Status'. .

RoadMap of Uploading Data in MTDvat: Click the hamburger menu of MTDvat -> Click on “Upload Data & Status” sub menu -> Choose "MTDvat" under "Download template" -> Fill the downloaded Spreadsheet -> Now, go to 'Upload Data' and Uplaod the file in CSV format -> To view the status of uploaded data . Click on "MTD VAT"  under 'Upload Data Status'.