File uploaded in Process Instance Edit and in Start process window does not save

[MikhailSilk]

Environment

• Platform version: 6.10-7.1

Description of the bug or enhancement

• Minimal reproducible example

Case 1

1. Create some BPM model with attachmentsVisible=true
2. Create a new Process Instances
3. Select Process Definition
4. Upload File to the attachments
5. Save Process Instances
6. Click Start Process button

• Actual behavior Platform show error messages "File not found"

Case 2 Create some BPM model with attachmentsVisible=true Create a new Process Instances Select Process Definition Save Process Instances Click Start Process button Upload File to the attachments Save the process Select the saved process Open editor the process instance

• Actual behavior Uploaded file not saved