The process of appending a new row or entity, either through the User Interface (UI) or programmtically through workflow or custom code, into an existing SharePoint list or library. Use this tag if your question/issue is specifically around adding a List or Library item.
The process of appending a new row or entity, either through the User Interface (UI) or programmtically through workflow or custom code, into an existing SharePoint list or library.
For references on adding items to existing lists or libraries in SharePoint, see:
UI: https://support.office.com/en-us/article/add-list-items-in-sharepoint-online-63414298-c53a-4c87-9255-2d10899f095e
PnPJS: https://github.com/SharePoint/PnP-JS-Core/wiki/Working-With:-Items#add-items
PowerShell: https://docs.microsoft.com/en-us/powershell/module/sharepoint-pnp/add-pnplistitem?view=sharepoint-ps
CSOM: https://docs.microsoft.com/en-us/previous-versions/office/developer/sharepoint-2010/ee539976(v%3Doffice.14)#creating-a-list-item
