To transfer files from Windows to z/OS (especially when z/OS file must be created with specific LRECL , RECFM, size, etc) - good way is to use ftp line command, entered in command prompt (Run->cmd ) window.
Below highlighted are few commands used to transfer character(not binary !) Windows file d:\downloads\USC.WRK.NOINTER.APFDBU.ACCESS2 to z/OS dataset USC.WRKTISH.NOINTER.APFDBU.ACCESS2
C:\Users\shaklein_ia>ftp stutvs13.megacenter.by.iba.com
Connected to STUTVS13.megacenter.by.iba.com.
220-TCPFTPH1 IBM FTP CS V2R4 at STUTVS13.megacenter.by.iba.com, 09:03:04 on 2021-04-12.
220 Connection will close if idle for more than 5 minutes.
501 command OPTS aborted -- no options supported for UTF8
User (STUTVS13.megacenter.by.iba.com:(none)): e544271
331 Send password please.
Password: _______
230 E544271 is logged on. Working directory is "E544271.".
ftp> ascii
200 Representation type is Ascii NonPrint
ftp> quote site lrecl=146 recfm=fb prim=20 sec=20 cyl
200-BLOCKSIZE must be a multiple of LRECL for RECFM FB
200-BLOCKSIZE being set to 6132
200 SITE command was accepted
ftp> put d:\downloads\USC.WRK.NOINTER.APFDBU.ACCESS2 'usc.wrktish.nointer.apfdbu.access2'
200 Port request OK.
125 Storing data set USC.WRKTISH.NOINTER.APFDBU.ACCESS2
250 Transfer completed successfully.
ftp: 16364508 bytes sent in 8.56Seconds 1911.52Kbytes/sec.
ftp> quit
221 Quit command received. Goodbye.