The upload can fail when
(i) The Sketchfab server does not respond
(ii) The excel file uploaded is not in line with the instructed format
(iii) Poor/Weak Internet Signal
Bulk Uploader stores your API Key in the encrypted format and is fully secured.
All the formats listed by Sketchfab on their 3D File Format Page.
The File Size limit is as per Free, Pro, Premium and Business account limit of Sketchfab. Read more
Yes, the Private upload is available as instructed by Sketchfab for Free, Pro, Premium and Business accounts. Read more