I read the codes available on the network from various sources, and debugged self-learning programming to make it work, but I have difficulty continuing.
As you can see, it comes from the source. Browsing a folder and reading files work fine with the code, I need to copy the values from this folder and paste them into the default template, as indicated in the code, and save the file with the standard format and next to the values from cell (O1) and (O11) in code.

As you can see, it is not saved as xlsx, and none of them are saved with values from the specified cell.
Next, the automation of data entry in the designated field. Only the first 3 files can copy exactly what I want. The rest is entering incorrect data, as shown in the figure below. In addition, I also need to copy the values from cell N15: O83, read from the files in the folder, to the Column AA and AB template, starting from line 6. respectively.
Thanks in advance for your help.
Sample source file.
Correct automation. Incorrect automation. 
 

Macrocode
Sub LoopAllExcelFilesInFolder()
'PURPOSE: To loop through all Excel files in a user specified folder and             perform a set task on them
'SOURCE: www.TheSpreadsheetGuru.com
Dim wb As Workbook
Dim myPath As String
Dim myFile As String
Dim myExtension As String
Dim FldrPicker As FileDialog
Dim InstID As String
Dim InstDate As Date
Dim InstBR As String
'Optimize Macro Speed
  Application.ScreenUpdating = False
  Application.EnableEvents = False
  Application.Calculation = xlCalculationManual
'Retrieve Target Folder Path From User
  Set FldrPicker = Application.FileDialog(msoFileDialogFolderPicker)
With FldrPicker
  .Title = "Select A Target Folder"
  .AllowMultiSelect = False
    If .Show <> -1 Then GoTo NextCode
    myPath = .SelectedItems(1) & "\"
End With
'In Case of Cancel
NextCode:
  myPath = myPath
  If myPath = "" Then GoTo ResetSettings
    'Target File Extension (must include wildcard "*")
  myExtension = "*.xls*"
  'Target Path with Ending Extention
  myFile = Dir(myPath & myExtension)
'Loop through each Excel file in folder
  Do While myFile <> ""
'Set variable equal to opened workbook
  Set wb = Workbooks.Open(Filename:=myPath & myFile)
'Ensure Workbook has opened before moving on to next line of code
  DoEvents
'Input Code Here
  InstID = Range("O1")
  InstDate = Range("O11")
  InstBR = "Base Reading"
  wb.Worksheets(1).Range("B15:E83").Copy
  Workbooks.Add template:="C:\Users\PC1\Desktop\Daily data file\Inc\TestTemplate.xlsx"
  Sheets(ActiveSheet.Index + 1).Activate
  If Err.Number <> 0 Then Sheets(1).Activate
  Range("M6").Select
Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
    :=False, Transpose:=False
    Range("E6:F76") = InstID
    Range("K6:K76") = InstDate
    Range("J6") = InstBR
ChDir ("C:\Users\PC\Desktop\Daily data file\Inc\INC22001 - Copy\Test Save") ' Directory you need to save the file as xlsm
Filename = ("Test_Data_ ") & Range("O1").Value & ";" &     Range("O11").Value
ActiveWorkbook.SaveAs Filename:=Filename, FileFormat:=xlOpenXMLWorkbook
'Save and Close Workbook
  wb.Close SaveChanges:=True
'Ensure Workbook has closed before moving on to next line of code
  DoEvents
'Get next file name
  myFile = Dir
  Loop
'Message Box when tasks are completed
  MsgBox "Task Complete!"
ResetSettings:
  'Reset Macro Optimization Settings
Application.EnableEvents = True
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub
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