How can i upload data to cloud application if the data size is more than 1 gb?

If the data size is above 1 Gb and you are unable to sync data it cloud sync mobile application, you need to update your BUSY along with BUSY mobile application.
To update the latest version of BUSY, you can follow these steps: 
Step 1: Take latest backup of your all data. 
Step 2: Go to BUSY Accounting Software and click on Check BUSY Updates under the Company Menu. 
Step 3: Select the location where you want to save setups and click on Download Updates, two setups will be download. 
Step 4: Close any instances of BUSY that are running on your computer. 
Step 5: You can install both setups by double-click on them to run them one by one. 
Step 6: Follow the instructions on the screen and choose the location where you want to install the software. Make sure to install in the same drive where already installed BUSY.
Step 7: Wait for the installation process to complete and click on the finish button.
To update the mobile application, follow these steps:
Step 1: Go to google play store in the device
Step 2: Write BUSY in search tab, you will an application with GST billing & accounting app
Step 3: Click on the application and then update the same.