count filename form a message

[Nilesh067]

message: 'Successfully downloaded the file : FileAData2020-10-20_19_05_05.csv'

message: 'Successfully downloaded the file : FileBData2020-10-20_19_05_05.csv'

message: 'Successfully downloaded the file : FileCData2020-10-20_19_05_05.csv'

message: 'Successfully downloaded the file : FileAData2020-10-20_19_05_05.csv'

how can I get output like 

FileName Count

FileA            2

FileB            1

FileC           1

[to4kawa]

index=_internal | head 1 | eval _raw="message: 'Successfully downloaded the file : FileAData2020-10-20_19_05_05.csv'
message: 'Successfully downloaded the file : FileBData2020-10-20_19_05_05.csv'
message: 'Successfully downloaded the file : FileCData2020-10-20_19_05_05.csv'
message: 'Successfully downloaded the file : FileAData2020-10-20_19_05_05.csv'"
| multikv noheader=t
| rename COMMENT as "the logic" 
| rex "file : (?<filename>\w+)Data"
| stats count by filename