I'll be putting the various How-To posts in here from now on.

Forum How-To Tips and Tricks
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Is there something similar for Galleries?
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Need to resize an image before uploading?
If your image is huge, say 1920x1080 and exceeds 3MB, you'll need to resize it.
Windows 10 Power Toys now has a feature for quick and easy image resizing, by right clicking on the image (i.e. on the desktop) and clicking Resize Pictures.
A dialogue box will then appear, allowing you to choose the size you want...
I usually go for 1366x768 which often reduces the weight of the picture to around 300kB without losing quality.
Windows 10 Power Toys is open source and can be downloaded from GitHub.
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Very helpful.