Filebin to upload gcode files for others to examine and preview.
Pastebin to provide firmware configuration information or other relevant data. Forums will often garble sensitive data like gcode or firmware configs that needs to be read accurately.
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Imgur to upload images of your problem. A picture paints a thousand words and is quite often the most effivient way to communicate a problem.
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Imgur to upload images of your problem. A picture paints a thousand words and is quite often the most efficient way to communicate a problem.
Streamable to upload a video of the problem. This again can be incredibly useful in helping others diagnose your problem.
All of the sites above are free to use and do not require an account for the core functionality.