If you get no error message how do you know it has not been saved?
Are you sure it us just the case that you cannot find it again once it has been saved?
In the Libraries (Shift+F) tool, click the Footprints tab and look in Workplace.
Does this help?
[https://easyeda.com/forum/topic/Parts-do-not-appear-listed-in-Personal-Library-after-clicking-Favorite-149f7976db1542918a7425cc9274d8e1](https://easyeda.com/forum/topic/Parts-do-not-appear-listed-in-Personal-Library-after-clicking-Favorite-149f7976db1542918a7425cc9274d8e1)
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