OK, so I thought that I will add a Step before creating a SharePoint file :
Add step "initialize the variable " and set :
base64(triggerBody()['Utwórzelement_MainID'])
Then In step create a SharePoint file in content use :
concat( base64(triggerBody()['Utwórzelement_MainID']), binary(base64ToBinary(triggerBody()['Utwórzplik_Zawartośćpliku'])) )

Then in on Item prop "OnAddFile" use :
Set(varShowPopup; true);;
// Preparing data from the Image3 control as base64 binary data
Set(varDemofromAtt_cont; JSON(Image3.Image; JSONFormat.IncludeBinaryData));;
Set(varbase64only; Mid(varDemofromAtt_cont; Find(","; varDemofromAtt_cont) + 1; Len(varDemofromAtt_cont) - Find(","; varDemofromAtt_cont) - 1));;
// Preparing the data for the "manual" trigger with a number (change it according to the expected scheme)
Set(varManualTriggerData; DataCardValue38);;
// Calling the Test_upoad_2.Run function with a number
Test_upoad_2.Run(
Last(Att_cont_1.Attachments).Name;
varbase64only;
varManualTriggerData // Passing data to the "manual" trigger
);;
Reset(Att_cont_1);;
Refresh(Listy_Kontrolne_Wagon_Zlecenie);;
Set(varShowPopup; false);;
Well still Errors :

refered to :

any tips ?