my problem is whatever browser i am using drag and drop builder doesn’t work. can you help me out?
Hi umair_fraz6h7vdi, welcome to Thunkable! 
Be sure to check out How to ask Great Questions v2.0, the Community Guidelines, and our Getting Started Guide to make the best of your Thunkable Community experience!
What browser are you using to open Thunkable? What is the specific issue you are having? Our minimum browser requirements are:
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Mozilla Firefox
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Google Chrome
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Apple Safari
More information is located here in our Docs: