First, save the file you received to your computer. Then, from your budgets menu, select + New budget:

Select Upload an existing Budgeting and Planning file and click Next:

Drag and drop the file you saved (look for the .bdg file extension), or click to browse for it. The budget will upload to your account.
You can now review and edit it (don't worry, it won't impact the original budget sent to you).

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