Okay, thank you guys -- making progress.
It works, sort of: The file "temp2.txt" is created and contains all the DHCP leases.
192.168.2.100,TV15,;78:6A:1F:8D:F9:C8,Theater
192.168.2.121,Ipad SRN,;DA:F3:68:BE:3F:0B,
192.168.2.102,STB,;78:6A:1F:8D:FC:B4,Master-Bedroom
192.168.2.101,STB,;78:6A:1F:8D:FC:0F,Living-Room
192.168.2.103,STB,;A0:68:7E:4D:D0:4B,Family-Room
192.168.2.138,MFCL3770CDW,;30:C9:AB:17:71:59,MFC-L3770
192.168.2.107,JRSLaptopASUS,;94:E7:0B:29:30:E7,
192.168.2.141,JRS iPhone,;C2:5D:7F:1F:4C:F5,
192.168.2.106,RB5009,;18:FD:74:CF:7F:5C,
192.168.2.109,Vizio on 15,;00:6B:9E:D1:24:F3,
192.168.2.147,TV,;3C:59:1E:F4:02:EF,212LR
192.168.2.122,Homepod,;D4:90:9C:D8:66:99,Living-Room
192.168.2.191,TV 15 SRN Office,;3C:59:1E:F4:3C:CB,SRNOffice
192.168.2.199,Playstation,;C8:63:F1:F1:9F:44,
192.168.2.119,ThomasMBP,;88:E9:FE:6E:97:9D,
192.168.2.128,MBR65TV,;34:51:80:C8:BB:2C,212MBR
192.168.2.200,HarmonyHub,;00:04:20:F9:31:D2,HarmonyHub
192.168.2.114,Thomas iPhone,;46:B4:96:5E:1A:1B,
192.168.2.176,,;18:03:73:3A:63:19,
192.168.2.142,SRNAppleWatch,;4E:FE:92:A6:40:CD,
192.168.2.124,Printer,;2C:6F:C9:5F:BC:EB,BRW2C6FC95FBCEB
192.168.2.173,NC-LT-SN20,;24:EE:9A:54:9A:E8,NC-LT-SN20
192.168.2.117,Printer,;B4:22:00:95:59:8A,BRNB4220095598A
192.168.2.127,Debian LXC under Proxmox,;0A:25:A1:71:46:7D,Debian
192.168.2.110,JRS-Laptop-2023,;64:49:7D:61:AE:2C,JRS-Laptop-2023
192.168.2.166,15 TV,;B0:A7:37:75:B6:60,15Theatre
192.168.2.105,Susans-iPhone,;C4:17:FE:43:33:07,
192.168.2.104,,;90:6E:BB:46:FA:09,
192.168.2.108,Denon AVR,;00:05:CD:19:3C:07,0005CD193C07
192.168.2.116,SRN iphone,;EA:C1:05:82:99:7C,
192.168.2.120,Thomas iPad large,;96:4E:A5:1A:A9:74,
192.168.2.123,Thomas Acer,;54:6C:EB:7B:A2:C3,TS-aceri7
192.168.2.113,hEX,;18:FD:74:38:81:2B,
192.168.2.112,JRS iPhone 2023,;FC:AA:81:2A:1F:B4,Jrs-iphone-2023
192.168.2.118,SRN Apple Watch,;36:41:EF:17:D0:C9,
192.168.2.115,Susan iPad,;16:31:50:11:6B:CF,
192.168.2.126,NOT any Thomas or Susan's Device,;7A:49:88:57:E9:14,
192.168.2.130,Padan?,;3C:06:30:20:01:70,Jonnys-MBP-3
192.168.2.133,?????,;F6:B9:88:DD:23:1A,
192.168.2.135,,;58:E4:88:97:C9:D1,
192.168.2.136,,;44:3D:54:A2:D1:14,
192.168.2.134,,;BE:22:C3:46:12:33,
192.168.2.111,THR316D T BR,;C8:F0:9E:E8:8A:E4,espressif
192.168.2.131,SRN iwatch,;D6:A9:86:B1:C9:3E,
192.168.2.129,Thomas -- ,;22:BC:D8:7F:66:FD,
192.168.2.132,,;3C:A6:F6:1F:87:AC,Rachels-Air
192.168.2.139,Rachel phone,;1A:B9:14:B4:55:EA,
192.168.2.140,Mini-PC from aliexpress,;68:1D:EF:38:E5:9B,Mini-PC-N100-Aliexpress-1
192.168.2.125,Thomas iPhone,;2E:EF:FE:36:A1:05,
192.168.2.137,JRS 2024 Desktop,;C8:7F:54:5A:69:13,JRS-2024-Deskto
192.168.2.144,,;3C:06:30:0C:EE:88,Sarahs-MBP-2
192.168.2.150,,;84:57:33:9B:83:85,XBOXONE
192.168.2.154,,;08:C3:B3:DF:26:62,65TCLRokuTV
192.168.2.153,,;5A:E0:C5:BC:79:F4,
192.168.2.172,,;E2:FB:B7:20:0D:6B,
192.168.2.174,,;C0:49:EF:8C:63:98,shellyplus1pm-c049ef8c6398
192.168.2.171,,;0C:62:A6:1E:8B:18,49TCLRokuTV
192.168.2.149,,;68:1D:EF:3A:DA:E0,T8-Mini-PC-26NNQ3ARVB1
192.168.2.175,,;CE:02:38:11:8C:3E,
192.168.2.100,TV15,;78:6A:1F:8D:F9:C8,Theater
192.168.2.121,Ipad SRN,;DA:F3:68:BE:3F:0B,
192.168.2.102,STB,;78:6A:1F:8D:FC:B4,Master-Bedroom
192.168.2.101,STB,;78:6A:1F:8D:FC:0F,Living-Room
192.168.2.103,STB,;A0:68:7E:4D:D0:4B,Family-Room
192.168.2.138,MFCL3770CDW,;30:C9:AB:17:71:59,MFC-L3770
192.168.2.107,JRSLaptopASUS,;94:E7:0B:29:30:E7,
192.168.2.141,JRS iPhone,;C2:5D:7F:1F:4C:F5,
192.168.2.106,RB5009,;18:FD:74:CF:7F:5C,
192.168.2.109,Vizio on 15,;00:6B:9E:D1:24:F3,
192.168.2.147,TV,;3C:59:1E:F4:02:EF,212LR
192.168.2.122,Homepod,;D4:90:9C:D8:66:99,Living-Room
192.168.2.191,TV 15 SRN Office,;3C:59:1E:F4:3C:CB,SRNOffice
192.168.2.199,Playstation,;C8:63:F1:F1:9F:44,
192.168.2.119,ThomasMBP,;88:E9:FE:6E:97:9D,
192.168.2.128,MBR65TV,;34:51:80:C8:BB:2C,212MBR
192.168.2.200,HarmonyHub,;00:04:20:F9:31:D2,HarmonyHub
192.168.2.114,Thomas iPhone,;46:B4:96:5E:1A:1B,
192.168.2.176,,;18:03:73:3A:63:19,
Like the FTP upload session gets halted in the middle. The FTP server on my PC says it finished fine.
I tried using "ascii=no" and I tried using the same src and dst file name. Still the same.