Certainly! You can create the `new_filename` by extracting the filename without the file extension and then appending the `max_resolution` followed by ".jpg". Here's the Python code to achieve this:

```python
filename = 'test.png'
max_resolution = '512x512'

# Extract the filename without the file extension
filename_without_extension = filename.split('.')[0]

# Create the new_filename by combining filename_without_extension, max_resolution, and '.jpg'
new_filename = f'{filename_without_extension}+{max_resolution}.jpg'

# Print the new_filename
print(new_filename)
```

When you run this code, it will generate `new_filename` as 'test+512x512.jpg'.
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