Here are steps to use custom picture in the form header:
1.Upload a picture into document library.
2.Select the picture -> Details -> Copy the path.
3.Use following JSON codes. You need to replace picture path with yours.
{
"elmType": "div",
"attributes": {
"class": "ms-borderColor-neutralTertiary"
},
"style": {
"width": "99%",
"border-top-width": "0px",
"border-bottom-width": "1px",
"border-left-width": "0px",
"border-right-width": "0px",
"border-style": "solid",
"margin-bottom": "16px"
},
"children": [
{
"elmType": "div",
"style": {
"display": "flex",
"box-sizing": "border-box",
"align-items": "center"
},
"children": [
{
"elmType": "img",
"attributes": {
"src": "https://tenant.sharepoint.com/sites/emilytest/Shared%20Documents/images.jpg",
"title": "Logo"
},
"style": {
"flex": "none",
"padding": "0px",
"padding-left": "10px",
"height": "80px",
"color": "white"
}
}
]
},
{
"elmType": "div",
"attributes": {
"class": "ms-fontColor-neutralSecondary ms-fontWeight-bold ms-fontSize-24"
},
"style": {
"box-sizing": "border-box",
"width": "100%",
"text-align": "left",
"padding": "21px 12px",
"overflow": "hidden"
},
"children": [
{
"elmType": "div",
"txtContent": "='Contact details for ' + [$Title]"
}
]
}
]
}
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