I would like to add a custom button on the default Document Library Ribbon. You know, like next to 'new','share','automate','myCostumBtn'
Any of you guys a good suggestion?
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Sign up to join this communityAs you are using SharePoint Online, I will suggest you to create a ListView Command Set for your document library using SPFx extensions.
Check below official documentations for same:
'CommandUI.Ribbon' user custom action is still supported in SP online. Please take a reference of below doc to get started:
Of course SPFx extension is also a good option.
BR