Hi @Lexignot,
Per my research, there is no such api to copy images from one Excel file to another by graph. You could refer to the following document
Working with Excel in Microsoft Graph
We could try to copy the whole excel file by following graph
https://graph.microsoft.com/v1.0/sites/{siteid}/drives/{driveid}/Items/{file id which you want to copy}/copy
Request Body:
{
"parentReference": {
"driveId": "{Same driveid of above call}",
"id": "{Folderid}"
},
"name": "contosoplan(copy).xlsx"
}
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