Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
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Maximum File Size of 129115298 bytes?
Amazon Drive no longer rendering CR2 images (415 error for previews on newly uploaded files)
Timeout when uploading certain JPEG files
Amazon Drive Reports "This Location is not Supported..." When Accessing Windows Network Share
File Upload Fails repeatedly at some point.