This is a image plugin for Obsidian (https://obsidian.md).
You can directly install this plugin in Obsidian.
Or
/path/to/yourvault/.obsidian/plugins
directly download the obsidain-image-size.zip in the latest release
put the whole folder into your vault's plugins folder
reload the obsidian plugins, and you can see Image Size
After set the default size in the setting of the plugin, you can paste any image with a size you set.
And, the pasted image will be stored in the folder you set.
Please make sure the folder you set exists!
It is strongly recommended to place the attachment folder in the project root directory!