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Forms having file uploads on them have bandwidth limitations.
Small files or those with a file size less than 10 MB can be viewed or downloaded 100 times.
Large files or those with a file size greater than 10 MB can be viewed or downloaded 10 times.
This has been impose to prevent further abused on the servers bandwidth. I have reset the bandwidth limit on the file mentioned in your screenshot, but please do note that we can only do this once per file. I would strongly recommend taking advantage of the file sharing and storage service integrations that we support like Dropdbox and Google Drive so that files can also be uploaded on that storage services directly.
Please note that when you reached the bandwidth limit on a specific file twice, you won't be able to access it anymore.
I hope that that helps.