How to remove an attibute from the field properties BEFORE the data is converted to JSON

[intellisoftwaremx]

I have a table let's call it file_data with a blob field among others. I've implemented ActivityLog in the model using this function:

    public function getActivitylogOptions(): LogOptions
    {
        return LogOptions::defaults()->logOnly(['*'])->useLogName('file_data')->logOnlyDirty(); 

    } // End Method

I want to log any change in any field including the blob. The problem comes when ActivityLog tries to write in the log table because when it attempts to add the blob in the properties field and that causes this error (I understand that this happens because of the blob data):

Unable to encode attribute [properties] for model [Spatie\Activitylog\Models\Activity] to JSON: Malformed UTF-8 characters, possibly incorrectly encoded.

I tried to change the blob data with just the size of it from the properties field using a tapActivity function,

public function tapActivity(Activity $activity, string $eventName)
{
    $activity->properties = $activity->properties->transform(function ($value, $key) {
        if (in_array($key, ['attributes', 'old']) && isset($value['file_data'])) {
            $value['file_data'] = strlen($value['file_data']) . ' bytes'; // Reemplaza con longitud
        }
        return $value;
    });
}

but it seems that the error is fired before that tapActivity function is called.

I changed my getActivitylogOptions function to include logExcept(["blob_field"]) like this:

   public function getActivitylogOptions(): LogOptions
    {
        return LogOptions::defaults()->logOnly(['*'])->logExcept(['file_data'])->useLogName('file_data')->logOnlyDirty(); 

    } // End Method

and the error disappeared but also if a change happens in the blob field the activitylog is not trigger.

The question is: How can I remove the blob data from the properties to:

1. ActivityLog reacts when there is a change in the blob data.
2. ActivityLog saves the record in the activity log table without the blob data in the properties field or maybe having the blob data being replaced with another text like "Blob Data".

Any Ideas?