Invalid images/files weren't removed prior to upload. Please make sure you remove these.
Your internet connection was interrupted. This interferes with the upload process.
Your computer went to sleep or was switched off.
There are too many tabs open, or too many cookies/cache are being stored. Uploading high resolution imagery is resource consuming so reducing the number of tabs you have open is best practice.
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Some errors and how to overcome them
Written by Karen JoyceUpdated over a week ago