Most probably you have exceeded some limits
- default value for the maxRequestLength
parameter in the section of the Machine.config file is 4096 (4 megabytes). As a result, files that are larger than this value are not uploaded by default.
- database server limits - RAM.
You can enable files provider
This will set your website to upload files on chunk of maximum 20 MB.
If you want you can decrease the value of
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