We're sorry to hear about this issue. Could you please let us know the file exported size? Can you share a screen recording of the issue to better assist you further?
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Thank you @Tarun Saini for your help! For example, I manually set the size to 4096x2160. After that, I want to export it with my custom size. I am using the Edge browser. However, when I click on the downloaded file and check the properties, it shows only 3840x2024. I'm not sure if I'm making a mistake or why the correct resolution isn't being downloaded. Thank you so much for your help!