a!submitUploadedFiles() is not working in Appian Portal. Getting APNX-1-4561-007 error always. Can someone help?

Hello All,

I am trying to upload file through Appian Portal, but a!submitUploadedFiles() is not working properly. i am getting APNX-1-4561-007 error always. I have created service account and provided appropriate security to Folder as well. Can someone help ?

a!localVariables(
local!fileUpload,
local!furesult,
a!formLayout(
label: "Form - "&local!furesult,
contents: {
a!sectionLayout(
contents: {
a!fileUploadField(
label: "File Upload",
labelPosition: "ABOVE",
value: local!fileUpload,
saveInto: local!fileUpload,
validations: {},
target: cons!SGPL_2023_PLAYER_PICS_FOLDER
)
}
)
},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidget(
label: "Submit",
submit: true,
style: "PRIMARY",
saveInto: a!submitUploadedFiles(
onSuccess: {
a!save(local!furesult, "Document Saved")
},
onError: { a!save(local!furesult, fv!error) }
)
)
},
secondaryButtons: {
a!buttonWidget(
label: "Cancel",
value: true,
saveInto: ri!cancel,
submit: true,
style: "NORMAL",
validate: false
)
}
)
)
)